71820 CDGC/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71820 CDGC/P4
Basic Information
System of measurement
Metric
Weight
0.31 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
34
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5062 lbf
Radial static load rating
6525 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71820 CDGC/P4 Bearing Product Overview & Core Advantages
The 71820 CDGC/P4 is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Positioned in the P4 tolerance class, it delivers superior running accuracy, making it ideal for demanding scenarios. A key feature is its Universal Matchable (SU) designation, allowing two bearings to be precisely matched and mounted in a duplex arrangement to support combined loads effectively. Pre-loaded to a Moderate / Class C level, it ensures high system stiffness and minimizes axial and radial play, contributing to its status as a high-precision bearing for critical machinery.
71820 CDGC/P4 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71820 CDGC/P4 provides detailed technical specifications through its suffixes:
- 71820: The basic bearing designation, indicating a single row angular contact ball bearing with a 100mm bore.
- C: Denotes a 15° contact angle, optimized for handling high axial loads in one direction combined with radial loads.
- DG: Signifies a Universal Matchable (SU) bearing. Two bearings are supplied as a matched set (face-to-face, back-to-back, or tandem) to provide pre-defined preload and precision.
- C: Indicates a Moderate / Class C preload, which enhances system rigidity and rotational accuracy.
- P4: Represents the tolerance class, confirming superior dimensional and running accuracy exceeding standard ABEC-7 / ISO Class 4 standards.
71820 CDGC/P4 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class and moderate preload ensure minimal runout and high system stiffness, critical for applications requiring precise shaft positioning.
- Optimized Load Capacity: The 15° contact angle is engineered to support significant combined loads (radial and axial). With a dynamic load rating of 5062 lbf and a static load rating of 6525 lbf, it offers reliable performance under demanding conditions.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, enabling a high limiting speed of 15,000 rpm. This makes it suitable for high-speed spindle applications.
- Superior Material Construction: Manufactured from chrome steel for both rings and balls, the bearing provides high fatigue life and durability. The open seal type allows for customized lubrication solutions to further optimize performance for specific operating conditions.
71820 CDGC/P4 Bearing Typical Application Areas
The 71820 CDGC/P4 is engineered for high-performance machinery where precision and speed are paramount. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
